Modeling Transport Properties And Electrochemical Performance Of Hierarchically Structured Lithium Ion Battery Cathodes Using Resistor Networks And Mathematical Half Cell Models
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Modeling Transport Properties And Electrochemical Performance Of Hierarchically Structured Lithium Ion Battery Cathodes Using Resistor Networks And Mathematical Half Cell Models
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Author : Birkholz, Oleg
language : en
Publisher: KIT Scientific Publishing
Release Date : 2022-10-05
Modeling Transport Properties And Electrochemical Performance Of Hierarchically Structured Lithium Ion Battery Cathodes Using Resistor Networks And Mathematical Half Cell Models written by Birkholz, Oleg and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-10-05 with Science categories.
Hierarchically structured active materials in electrodes of lithium-ion cells are promising candidates for increasing gravimetric energy density and improving rate capability of the system. To investigate the influence of cathode structures on the performance of the whole cell, efficient tools for calculating effective transport properties of granular systems are developed and their influence on the electrochemical performance is investigated in specially adapted cell models.
Dynamic Model Based Analysis Of Oxygen Reduction Reaction In Gas Diffusion Electrodes
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Author : Röhe, Maximilian
language : en
Publisher: KIT Scientific Publishing
Release Date : 2024-01-09
Dynamic Model Based Analysis Of Oxygen Reduction Reaction In Gas Diffusion Electrodes written by Röhe, Maximilian and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-01-09 with categories.
In this work, the first simulation model of oxygen depolarized cathodes (ODC), which are silver catalyst-based gas diffusion electrodes, is presented that considers the phase equilibrium of the gas-liquid interface and structure-related inhomogeneities in electrolyte distribution. By means of the model it has been identified that mass transport of water and ions in the liquid phase is a crucial factor for electrode performance and how it is influenced by the electrode structure.
Multiscale Modeling Of Curing And Crack Propagation In Fiber Reinforced Thermosets
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Author : Schöller, Lukas
language : en
Publisher: KIT Scientific Publishing
Release Date : 2024-03-15
Multiscale Modeling Of Curing And Crack Propagation In Fiber Reinforced Thermosets written by Schöller, Lukas and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-03-15 with categories.
During the production of fiber-reinforced thermosets, the resin material undergoes a reaction that can lead to damage. A two-stage polymerization reaction is modeled using molecular dynamics and evaluations of the system including a fiber surface are performed. In addition, a phase-field model for crack propagation in heterogeneous systems is derived. This model is able to predict crack growth where established models fail. Finally, the model is used to predict crack formation during curing.
Development Of Nbn Based Kinetic Inductance Detectors On Sapphire And Diamond Substrates For Fusion Plasma Polarimetric Diagnostics
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Author : Mazzocchi, Francesco
language : en
Publisher: KIT Scientific Publishing
Release Date : 2022-07-01
Development Of Nbn Based Kinetic Inductance Detectors On Sapphire And Diamond Substrates For Fusion Plasma Polarimetric Diagnostics written by Mazzocchi, Francesco and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-07-01 with Technology & Engineering categories.
This work aimed at designing, studying and producing the first prototypes of KIDs tailored for fusion plasma polarimetric diagnostics. Diamond was considered for the first time as substrate material for low-temperature superconducting detectors given its unmatched optical, radiation hardness and thermal qualities, properties necessary for working environments potentially saturated with radiation. This work represents a first step toward the optimization and final application of this technology.
Numerische Modellierung Und Simulation Von Bleifreien Relaxor Ferroelektrikum Kompositen
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Author : Streich, Friedemann
language : de
Publisher: KIT Scientific Publishing
Release Date : 2023-03-24
Numerische Modellierung Und Simulation Von Bleifreien Relaxor Ferroelektrikum Kompositen written by Streich, Friedemann and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-03-24 with Technology & Engineering categories.
Das elektromechanische Verhalten zweier neu entwickelten, auf Natrium-Bismut-Titanat basierenden bleifreier Ferroelektrika sowie daraus bestehenden Zweilagenkompositen wird durch Experimente und numerische Simulationen untersucht. Für die Finite-Elemente-Methode wird hierzu ein dreidimensionales, vollständig elektromechanisch gekoppeltes Materialmodell entwickelt. An Hand einer Parameterstudie werden die elektromechanischen Kopplungseigenschaften der Zweilagenkomposite optimiert. - The electromechanical behavior of two new sodium bismuth titanate based lead-free ferroelectric materials as well as bilayer composites are investigated in experiments and numerical simulations. For the Finite-Element-Method, a fully coupled, three dimensional ferroelectric constitutive model is developed. In a parameter study, the electromechanical coupling of bilayer composite is optimized.
Multiskalige Modellierung Von Lithium Ionen Batterien
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Author : Schmidt, Adrian
language : de
Publisher: KIT Scientific Publishing
Release Date : 2022-09-27
Multiskalige Modellierung Von Lithium Ionen Batterien written by Schmidt, Adrian and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-09-27 with Technology & Engineering categories.
In dieser Arbeit werden Modellansätze für die internen Prozesse großformatiger Lithium-Ionen-Batterien entwickelt sowie experimentell parametriert und validiert. Damit werden sowohl die elektrochemischen Verluste in den Elektroden untersucht als auch deren Wechselwirkung mit der Potential- und Temperaturverteilung großformatiger Zellen. Darüber hinaus werden zulässige Betriebsbedingungen der Zellen identifiziert sowie Potentiale hinsichtlich der Leistungs- und Energiedichtesteigerung aufgezeigt. - In this work, model approaches for the internal processes of large-format lithium-ion batteries are developed, experimentally parameterized, and validated. The electrochemical losses in the electrode’s microstructure are investigated as well as their interaction with the heterogeneous potential and temperature distribution of large-format cells. In addition, permissible operating conditions of the cells are identified as well as potentials with regard to increasing power and energy density.
Analyse Und Modellbildung Von Pem Brennstoffzellen Mittels Elektrochemischer Impedanzspektroskopie
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Author : Heinzmann, Marcel
language : de
Publisher: KIT Scientific Publishing
Release Date : 2024-01-24
Analyse Und Modellbildung Von Pem Brennstoffzellen Mittels Elektrochemischer Impedanzspektroskopie written by Heinzmann, Marcel and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-01-24 with categories.
Diese Arbeit präsentiert ein physikalisch motiviertes Modell zur Vorhersage des Strom-/Spannungsverhaltens von PEM-Brennstoffzellen. Durch umfangreiche Impedanzmessungen und DRT-Analysen wurden alle Verlustprozesse identifiziert und quantifiziert. Das entwickelte Modell wurde erfolgreich validiert und bietet Einblicke in die internen Vorgänge der Brennstoffzelle. Es ermöglicht eine gezielte Optimierung und zeigt großes Potenzial für die Leistungssteigerung von PEM-Brennstoffzellen. - This work presents a physically motivated model for predicting the current/voltage behavior of PEM fuel cells. Extensive impedance measurements and DRT analyses were used to identify and quantify all loss processes. The developed model was successfully validated and provides insights into the internal processes of the fuel cell. It enables targeted optimization and shows great potential for increasing the performance of PEM fuel cells.
Materiell Nichtlineare Kontinuumsmodellierung Ferroelektrischer Funktionskeramiken Mit Piezoelektrischen Und Flexoelektrischen Eigenschaften
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Author : Sutter, Felix
language : de
Publisher: KIT Scientific Publishing
Release Date : 2024-03-15
Materiell Nichtlineare Kontinuumsmodellierung Ferroelektrischer Funktionskeramiken Mit Piezoelektrischen Und Flexoelektrischen Eigenschaften written by Sutter, Felix and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-03-15 with categories.
Die vorliegende Arbeit beschäftigt sich mit der Entwicklung eines makroskopischen Kontinuumsmodells zur Untersuchung des Einflusses des flexoelektrischen Effekts auf mikrostrukturelle Domänenumklappprozesse in ferroelektrischen Funktionskeramiken. Dabei ist von Interesse, ob in Piezokeramiken durch direkte Flexoelektrizität ein Polungsprozess in Gang gesetzt werden kann und ob durch indirekte Flexoelektrizität eine Verbesserung der aktorischen Eigenschaften eines IDE-Wafers möglich ist. - The present work deals with the development of a macroscopic continuum model to investigate the influence of the flexoelectric effect on microstructural domain switching processes in ferroelectric ceramics. It is of interest whether direct flexoelectricity can initiate a poling process in piezoceramics and if indirect flexoelectricity can improve the actuator performance of an IDE wafer.
Modellierung Der Mechanik Und Der Effektiven Transporteigenschaften Von Partikul Ren Kathoden Sowie Deren Einfluss Auf Die Elektrochemische Performance Von Lithium Ionen Batterien
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Author : Becker, Verena Irene
language : de
Publisher: KIT Scientific Publishing
Release Date : 2022-06-14
Modellierung Der Mechanik Und Der Effektiven Transporteigenschaften Von Partikul Ren Kathoden Sowie Deren Einfluss Auf Die Elektrochemische Performance Von Lithium Ionen Batterien written by Becker, Verena Irene and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-06-14 with Technology & Engineering categories.
In der vorliegenden Arbeit werden Lithium-Ionen-Batterien numerisch untersucht. Der Einfluss des Kalandrierens einer Elektrode auf die mechanisch induzierten Änderungen in der Mikrostruktur und die resultierende Performance einer Zelle sind dabei im Fokus. Der Einfluss variierender Partikelformen sowie plastischer Materialeigenschaften wird analysiert. Entscheidend hierbei ist die Bestimmung der effektiven Transporteigenschaften, die die Performance einer Batterie maßgeblich beinflussen. - In the present work, lithium-ion battery cathodes and battery half-cells are numerically investigated. Of main interest is the influence of the calendering of an electrode during its manufacture on the mechanically induced changes in the microstructure and the resulting performance characteristics of a cell. In particular, the influence of varying particle shape and plastic material properties is considered.
Entwicklung Und Charakterisierung Von Siliziumnitrid Siliziumkarbidkompositen F R Den Einsatz In Tribologisch Hochbeanspruchten Gleitsystemen
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Author : Zielonka, Paul S.
language : de
Publisher: KIT Scientific Publishing
Release Date : 2023-05-15
Entwicklung Und Charakterisierung Von Siliziumnitrid Siliziumkarbidkompositen F R Den Einsatz In Tribologisch Hochbeanspruchten Gleitsystemen written by Zielonka, Paul S. and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-05-15 with Technology & Engineering categories.
Im Rahmen dieser Arbeit werden Siliziumnitrid–/Siliziumkarbidkompositwerkstoffe für tribologisch hochbeanspruchte Anwendungen entwickelt und charakterisiert. Bei der Charakterisierung der Kompositwerkstoffe wird der Zusammenhang zwischen dem Siliziumkarbidgehalt und der entstehenden Mikrostruktur sowie den mechanischen Eigenschaften dargestellt. Tribologisch wurden die Werkstoffe in Modellversuchen untersucht. Dabei zeigten sie ein sehr gutes Reib- und Verschleißverhalten. - In this work, silicon nitride/silicon carbide composites are manufactured and characterized for tribologically highly stressed applications. The characterization of the composite materials shows the influence of the silicon carbide content on the resulting microstructure and the mechanical properties. The friction properties of the composite materials were characterized in tribological experiments. The composites show very good friction and wear behavior.